EP 0251684 B1 19900801 - CAM-CONTROLLED SELF-CONTAINED INTERNAL COMBUSTION FASTENER DRIVING TOOL
Title (en)
CAM-CONTROLLED SELF-CONTAINED INTERNAL COMBUSTION FASTENER DRIVING TOOL
Publication
Application
Priority
US 88134386 A 19860702
Abstract (en)
[origin: EP0251684A1] A fastener driving tool (1) powered by internal combustion of an air/fuel mixture. The tool body contains connected upper and lower coaxial cylinders. The upper cylinder is provided with a piston assembly (43) and is connected by a one-way valve (55) to a combustion air chamber (54). The lower cylinder (8) contains a piston/driver assembly and is surrounded by and connected to a return air chamber (11). The upper cylinder piston assembly (43) and the lower cylinder piston/driver assembly (34), when in their normal unactuated positions, define therebetween a combustion chamber (61) provided with an ignition device. A positive trigger-actuated cam system (120), upon actuation of the trigger (86), is configured to open a fuel valve (111) to introduce a measured amount of a gaseous fuel from a source thereof into the combustion chamber (61); to thereafter open an air valve (55) to introduce a measured quantity of air from the combustion air chamber (54) into the combustion chamber (61); to next actuate the ignition device to combust the air-fuel-mixture causing the lower cylinder piston/driver assembly (34) to drive a fastener (63) and to fill the return air chamber (11) with air under pressure in the upper cylinder piston assembly (43) to replenish air under pressure in the combustion air chamber (54); and finally to actuate a control valve operating an exhaust valve eliminating products of combustion enabling the upper cylinder piston assembly (43) to return to its normal position and air from the return air chamber (11) to return the lower cylinder piston/driver assembly (34) to its normal position.
IPC 1-7
IPC 8 full level
B25C 1/08 (2006.01)
CPC (source: EP KR US)
B25C 1/08 (2013.01 - EP KR US)
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0251684 A1 19880107; EP 0251684 B1 19900801; AU 7496287 A 19880107; CA 1291712 C 19911105; DE 3764036 D1 19900906; JP S6328576 A 19880206; KR 880001375 A 19880423; US 4721240 A 19880126
DOCDB simple family (application)
EP 87305629 A 19870624; AU 7496287 A 19870630; CA 540650 A 19870626; DE 3764036 T 19870624; JP 16410887 A 19870702; KR 870006982 A 19870701; US 88134386 A 19860702